unperceivability

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The consequence of the unperceivability of depth that will be important for us is this: every visible triangle is indistinguishable from some spherical triangle.
Reid himself certainly connects the geometry of visibles with the unperceivability of depth.
However we resolve the issue whether Reid's argument depends on the unperceivability of depth, there is another way in which adding a second eye threatens to undermine his case.